package com.cse.utils;

import lombok.RequiredArgsConstructor;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
@RequiredArgsConstructor
public class RedisIdWorker {
    private static final long BEGIN_TIMESTARMP=1744416000;
    //序列号位数
    private static final long COUNT_BITS=32;
    private  final StringRedisTemplate stringRedisTemplate;

public long nextId(String keyPrefix){
    //生成时间戳
    LocalDateTime now=LocalDateTime.now();
    long nowSecond=now.toEpochSecond(ZoneOffset.UTC);
    long timestamp=nowSecond-BEGIN_TIMESTARMP;
    //生成序列号
      //获取当前日期，精确到天
    String date=now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
      //自增长
    long count = stringRedisTemplate.opsForValue()
            .increment("icr" + keyPrefix + ";" + date);

    //拼接并返回
    return timestamp << COUNT_BITS|count;
}
}
